2.8 Usm Wide Angle Lens

Canon 2509A003 - Ef 20Mm F/2.8 Usm Wide Angle Lens - F/2.8 Owners Manuals, User Guides, Instructional Help Documents & Operating Information - ef20f28usm-im3-eng.pdf

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EF Lenses EF50mm f/1.4 USM EF85mm f/1.8 USM EF100mm f/2 USM EF200mm f/2.8L USM

EF14mm f/2.8L USM EF20mm f/2.8 USM EF24mm f/1.4L USM EF28mm f/1.8 USM EF35mm f/1.4L USM

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Distance scale Infrared index Distance index Contacts Lens mount index Focus mode switch Focusing ring

Instructions Thank you for purchasing a Canon product. Safety Precautions

1. Do not look at the sun or a bright light source through the lens or camera. Doing so could result in loss of vision. Looking at the sun directly through the lens is especially hazardous. 2. Whether it is attached to the camera or not, do not leave the lens under the sun without the lens cap attached. This is to prevent the lens from concentrating the sun’s rays, which could cause a fire.

Handling Cautions

If the lens is taken from a cold environment into a warm one, condensation may develop on the lens surface and internal parts. To prevent condensation in this case, first put the lens into an airtight plastic bag before taking it from a cold to warm environment. Then take out the lens after it has warmed gradually. Do the same when taking the lens from a warm environment into a cold one.

1. Mounting and Detaching the Lens

See your camera’s instructions for details on mounting and detaching the lens. • After detaching the lens, place the lens with the rear end up to prevent the lens surface and contacts from getting scratched. • If the contacts get soiled, scratched, or have fingerprints on them, corrosion or faulty connections can result. The camera and lens may not operate properly. • If the contacts get soiled or have fingerprints on them, clean them with a soft cloth. • If you remove the lens, cover it with the dust cap. To attach it properly, align the lens mount index and the  index of the dust cap, and turn clockwise. To remove it, reverse the order.

2. Setting the Focus Mode

To shoot in autofocus (AF) mode, set the focus mode switch to AF ❹ . To shoot in manual focus (MF) mode, set the focus mode switch to MF, and focus by turning the focusing ring. The focusing ring always works, regardless of the focus mode. • After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button halfway and turning the focusing ring (Full-time manual focus) ❺ .

3. Infinity Compensation Mark


To compensate for shifting of the infinity focus point that results from changes in temperature. The infinity position at normal temperature is the point at which the vertical line of the L mark is aligned with the distance indicator on the distance scale ❻ . • For accurate focusing in MF on subjects at infinity distance, look through the viewfinder while rotating the focusing ring.

4. Infrared Index


❶ ●

The infrared index corrects the focus setting when using monochrome infrared film. Focus on the subject in MF, then adjust the distance setting by moving the focusing ring to the corresponding infrared index mark ❼ . • Some EOS cameras cannot use infrared film. See the instructions for your EOS camera. • The infrared index position is based on a wavelength of 800 nm. • Be sure to observe the manufacturer’s instructions when using infrared film. • Use a red filter also when you take the picture.

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❹ ●

❺ ●

❻ ●

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5. Filters

You can attach filters to the filter mounting thread on the front of the lens. • Use a polarizing Canon filter. Filter holder for the EF14mm f/2.8L USM There is a gelatin filter holder at the rear of the lens. Cut the gelatin filter to fit within the white frames. Then insert the gelatin filter into the filter holder ❽ .

6. Hood

The lens hood can keep unwanted light out of the lens, and also protects the lens from rain, snow, and dust. EF50mm f/1.4 USM Fit the hood to the hood mount, then turn it in the direction of the arrow to attach it securely. EF20mm f/2.8 USM, EF24mm f/1.4L USM, EF28mm f/1.8 USM, and EF35mm f/1.4L USM To attach the hood, align the hood’s attachment position mark with the red dot on the front of the lens, then turn the hood in the direction of the arrow until t